Need pro advice Project X Block build Long term project.

yellow rose said

Heard that and never tried it. I do know last summer we had issues with MLS head gasket leaks and copper wire in the grooves that was milled off.

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Yes, it's better to leave them open. I know it sounds impossible, but it's worked so far. Just did it recently on a sb with an R3 block, just used a 4.100 bore gasket on the 4.070 bore block and no problems.